CT scanners - can give a 3d image which will reduce taking stuff out of bags. But it is difficult to know whether it will actually be quicker. If you examine the actual bottle neck at airport security checkpoints, the bottle neck is at the xray and not the at the removal of laptop stage. Im not sure that viewing a 3D image which requires moving the images around 3 axes to properly view it is quicker than a 2d image. Additionally, significant amount of time is required to build the 3D image. This is because the CT scanner actually takes multiple slices and then reconstructs a 3d image via a computer.
My speculation is that it will make the process more accurate. Faster?. Not sure.